STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A015BPO

No Mark

 - - 4N
A015BPO

No Mark (w/ Washer)

 A015BPO

No Mark (w/ Washer)

 A0158AS

No Mark

 5N (4T)
A0156UU - - 6N
- A015AS1 A0155EU 7N (5T)
A015C6R - - 8N
A0155NW A015CE2 A015A9C

No Mark

 10N (7T)
A0155XQ - - 11N
A0158F0 - - 12N

Tech Tips


  • *: Nut with 1 or more marks on one side surface of the nut.

  • Use a nut with the same nut strength classification number (or more) as the bolt strength classification number when tightening parts with a bolt and nut.


    Example:

  • Bolt = 4T

  • Nut = 4N or more